AXIL X20 Passive Earplugs - Slate Green - The X20 Earplug product is designed to provide the user with hearing protection against two types of noise: continuous noise and impulse noise. The X20 Earplug features multiple tip sizes and styles to choose from. This lets you fully customize what feels best for you while protecting your hearing. Ideal for extreme noise environments such as sleeping, air travel, concerts, auto racing, stadium events, shooting, machine shops, farming, roadbuilding, and construction; any situation where health and safety require the use of hearing protection i.e. where noise levels are above the safe limit of 85 dB.